将Image对象保存为png文件

PngTools及CRCUtil及BytesTools是网络上找的资源。

 

package lab.sodino.img;import java.io.IOException;import java.io.OutputStream;import javax.microedition.io.Connector;import javax.microedition.io.file.FileConnection;import javax.microedition.lcdui.Graphics;import javax.microedition.lcdui.Image;import javax.microedition.midlet.MIDlet;import javax.microedition.midlet.MIDletStateChangeException;/** @author sodino */public class PngSaveTest extends MIDlet {protected void destroyApp(boolean unconditional) throws MIDletStateChangeException {// TODO Auto-generated method stub}protected void pauseApp() {// TODO Auto-generated method stub}protected void startApp() throws MIDletStateChangeException {Image img = createSaveImg();byte[] data = PngTools.imageToPng(img, 8);try {FileConnection fc = (FileConnection) Connector.open("file:///root1/test.png");if (fc.exists() == false) {fc.create();}OutputStream os = fc.openOutputStream();os.write(data);os.close();fc.close();} catch (IOException e) {e.printStackTrace();}}private Image createSaveImg() {int imgWH = 200;Image img = Image.createImage(imgWH, imgWH);Graphics g = img.getGraphics();g.setColor(0xffff00);g.fillRect(0, 0, imgWH, imgWH);g.setColor(0xff);g.drawString("SodinoTest", imgWH >> 1, imgWH >> 1, Graphics.HCENTER | Graphics.TOP);return img;}}

 

 

package lab.sodino.img;import javax.microedition.lcdui.Image;public class PngTools {/** * png 色深 */public static final int BIT4 = 4;public static final int BIT8 = 8;/** *//** PNG tag. */private static final byte PNG[] = { -119, 80, 78, 71, 13, 10, 26, 10 };/** *//** IHDR tag. */private static final byte IHDR[] = { 73, 72, 68, 82 };/** *//** PLTE tag. */private static final byte PLTE[] = { 0x50, 0x4C, 0x54, 0x45 };/** *//** IDAT tag. */private static final byte IDAT[] = { 73, 68, 65, 84 };/** *//** LZ77 tag. */private static final byte LZ77[] = { 0x78, (byte) 0xDA, 0x01 };/** *//** IEND tag. */private static final byte IEND[] = { (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x49, (byte) 0x45,(byte) 0x4E, (byte) 0x44, (byte) 0xAE, (byte) 0x42, (byte) 0x60, (byte) 0x82 };/** *//** * @功能 Image转 ?PNG字节 * @ ? 数 Image srcImage 原图<br> * int bit色深<br> * @返回值 转 ? ? 的图片 * */public static byte[] imageToPng(Image srcImg, int bit) {int srcW = srcImg.getWidth();int srcH = srcImg.getHeight();int[] srcRGB = new int[srcW];int[] nColorArr = new int[0];// ? 出图片中所用到的所有颜色for (int i = 0; i < srcH; i++) {// ? 一行颜色srcImg.getRGB(srcRGB, 0, srcW, 0, i, srcW, 1);// ? 一行颜色中的 ? ? 值int[] temp = GetColorArr(srcRGB);// 将本行与上一次的结果连接int[] count = new int[nColorArr.length + temp.length];System.arraycopy(nColorArr, 0, count, 0, nColorArr.length);System.arraycopy(temp, 0, count, nColorArr.length, temp.length);// ? 连接 ? 的结果 ?次 ? ? ? 颜色nColorArr = GetColorArr(count);}// 如果没找到颜色则返回空if (nColorArr.length == 0) {return null;}int nPosCRC = 0;byte[] bRet;// 固定头bRet = BytesTools.appendBytes(null, PNG);// 固定头长度bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(13));nPosCRC = bRet.length;// IHDRbRet = BytesTools.appendBytes(bRet, IHDR);// 宽bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(srcW));// 高bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(srcH));// 色深bRet = BytesTools.appendBytes(bRet, (byte) bit);// 颜色类型bRet = BytesTools.appendBytes(bRet, 0x03);// 规定此处总为0bRet = BytesTools.appendBytes(bRet, 0x00);// ? 上bRet = BytesTools.appendBytes(bRet, 0x00);// ? 隔行扫 ??bRet = BytesTools.appendBytes(bRet, 0x00);// 头信 ? CRC &nb, sp;int nCRC = CRCUtil.checksum(bRet, nPosCRC, bRet.length - nPosCRC);bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(nCRC));// 颜色总数int nColorLen = nColorArr.length;bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(nColorLen * 3));nPosCRC = bRet.length;// PLTEbRet = BytesTools.appendBytes(bRet, PLTE);for (int i = 0; i < nColorLen; i++) {bRet = BytesTools.appendBytes(bRet, intToRGBBytes(nColorArr[i]));}// CRC PLTEnCRC = CRCUtil.checksum(bRet, nPosCRC, bRet.length - nPosCRC);bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(nCRC));// IDTA长度int nIdtaLen = 0;if (bit == BIT4) {nIdtaLen = (srcW / 2 + 1) * srcH;} else if (bit == BIT8) {nIdtaLen = (srcW + 1) * srcH;}int nLen = 4 + LZ77.length + 4 + nIdtaLen;bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(nLen));nPosCRC = bRet.length;// IDATbRet = BytesTools.appendBytes(bRet, IDAT);// 无压缩的LZ77压缩 ?bRet = BytesTools.appendBytes(bRet, LZ77);// 长度bRet = BytesTools.appendBytes(bRet, getIDATLen(nIdtaLen));// 数 ? 区域int nAl = bRet.length;if (bit == BIT4) {bRet = BytesTools.appendBytes(bRet, getPngBytes(srcImg, nColorArr));} else if (bit == BIT8) {bRet = BytesTools.appendBytes(bRet, getPngBytes8(srcImg, nColorArr));}// Adler32bRet = BytesTools.appendBytes(bRet, Adler(bRet, nAl, bRet.length - nAl));// CRCnCRC = CRCUtil.checksum(bRet, nPosCRC, bRet.length - nPosCRC);bRet = BytesTools.appendBytes(bRet, BytesTools.intToBytes(nCRC));// IENDbRet = BytesTools.appendBytes(bRet, IEND);return bRet;}// Adler校验private static byte[] Adler(byte[] bData, int nStart, int nLen) {int adler1 = 1;int adler2 = 0;nLen += nStart;for (int i = nStart; i < nLen; i++) {adler1 = adler1 + ((int) bData[i] & 0xff);adler2 = adler1 + adler2;adler1 %= 65521;adler2 %= 65521;}int nRet = (adler2 << 16) | adler1;return BytesTools.intToBytes(nRet);}// 8 ?色深IDAT数 ?private static byte[] getPngBytes8(Image srcImg, int[] nColorArr) {int srcW = srcImg.getWidth();int srcH = srcImg.getHeight();int[] srcRGB = new int[srcW];byte[] bRet = new byte[(srcW + 1) * srcH];int nPos = 0;for (int i = 0; i < srcH; i++) {srcImg.getRGB(srcRGB, 0, srcW, 0, i, srcW, 1);nPos = i;bRet[i * srcW + nPos] = 0;for (int j = 0; j < srcW; j++) {bRet[i * srcW + nPos + j + 1] = (byte) (getColorIndex(srcRGB[j], nColorArr) & 0xFF);}}return bRet;}// 4 ?色深IDAT数 ?private static byte[] getPngBytes(Image srcImg, int[] nColorArr) {int srcW = srcImg.getWidth();int srcH = srcImg.getHeight();int[] srcRGB = new int[srcW];byte[] bRet = new byte[(srcW / 2 + 1) * srcH];int nPos = 0;for (int i = 0; i < srcH; i++) {srcImg.getRGB(srcRGB, 0, srcW, 0, i, srcW, 1);nPos = i;bRet[i * srcW / 2 + nPos] = 0;int nIndex = 0;for (int j = 0; j < srcW; j++) {if (j % 2 == 1 && j != 0) {nIndex = nIndex | (getColorIndex(srcRGB[j], nColorArr) & 0xFF);bRet[i * srcW / 2 + j / 2 + 1 + nPos] = (byte) nIndex;} else {nIndex = (getColorIndex(srcRGB[j], nColorArr) & 0xFF) << 4;}}}return bRet;}// ? 颜色索引private static int getColorIndex(int nColor, int[] nColorArr) {int nLen = nColorArr.length;int nIndex = -1;for (int i = 0; i < nLen; i++) {if (nColor == nColorArr[i]) {nIndex = i;break;}}return nIndex;}// 将一个int color转红绿 ?byte数组private static byte[] intToRGBBytes(int nColor) {byte[] bColor = new byte[3];// 红bColor[0] = (byte) (nColor >> 16 & 0xFF);// 绿bColor[1] = (byte) (nColor >> 8 & 0xFF);// ?bColor[2] = (byte) (nColor & 0xFF);return bColor;}// IDAT数 ? 的长度，格 ?为： ?两字节为IDAT长度，低字节在 ?, ? 两字节为 ?两字节的^值.private static byte[] getIDATLen(int nLen) {byte[] bRet = new byte[4];bRet[0] = (byte) (nLen & 0xFF);bRet[1] = (byte) (nLen >> 8 & 0xFF);bRet[2] = (byte) (bRet[0] ^ 0xFF);bRet[3] = (byte) (bRet[1] ^ 0xFF);return bRet;}// 从一个int数 ? 中 ? 出 ? ? 的int值private static int[] GetColorArr(int[] nArr) {int nLen = nArr.length;int nRet[] = new int[0];for (int i = 0; i < nLen; i++) {int nrLen = nRet.length;boolean is = true;for (int j = 0; j < nrLen; j++) {if (nArr[i] == nRet[j]) {is = false;break;}}if (is) {int[] temp = new int[nrLen + 1];System.arraycopy(nRet, 0, temp, 0, nrLen);temp[nrLen] = nArr[i];nRet = temp;}}return nRet;}/** * change image to support alpha * * @param img source image * @param alphaColor color data ,such as : 0x00rrggbb * @return alpha image */final static Image createAlphaImage(Image img, int alphaColor) {int w = img.getWidth();int h = img.getHeight();int[] imgData = new int[w * h];img.getRGB(imgData, 0, w * h, 0, 0, w, h);for (int i = 0; i < imgData.length; i++) {if ((imgData[i] & alphaColor) == alphaColor) {imgData[i] = imgData[i] & alphaColor;}}Image alphaImage = Image.createRGBImage(imgData, w, h, true);return alphaImage;}static public String convertToString(double number) {String strRaw;String strResult;int signBase = 1;int signIndex = 1;int baseStartBit = -1;int baseDotBit = -1;int expSymbolBit = -1;int index = 0;int i;int bitCount;// Just for test// strRaw = "+123456789.123456789E-5";// strRaw = "-123456789.123456789E+5";// strRaw = "123456789.123456789E5";// strRaw = "-123456789.123456789E15";// strRaw = "-123456789.123456789E9";// strRaw = "+123456789.123456789E-15";// strRaw = "+123456789.123456789E-9";// strRaw = "123E10";// strRaw = "123E-10";// strRaw = "123E-2";// strRaw = "123";// strRaw = "123.0";strRaw = Double.toString(number);strResult = new String();bitCount = strRaw.length();System.out.println("strRaw = " + strRaw);for (i = 0; i < bitCount; i++) {if (strRaw.charAt(i) == '+') {// Do nothing;} else if (strRaw.charAt(i) == '-') {if (baseStartBit == -1) {signBase = -1;} else if (expSymbolBit != -1) {signIndex = -1;} else {return null; // the format of double number is illegal.}} else if (strRaw.charAt(i) == 'E' || strRaw.charAt(i) == 'e') {if (expSymbolBit != -1) {return null;}expSymbolBit = i;} else if (strRaw.charAt(i) == '.') {if (baseStartBit == -1 || expSymbolBit != -1) {return null; // the format of double number is illegal}baseDotBit = i;} else {if (baseStartBit == -1) {baseStartBit = i;} else if (expSymbolBit != -1) {index = index * 10 + Character.digit(strRaw.charAt(i), 10);}}}if (baseStartBit == -1) {return null;}if (signBase == -1) {strResult += "-";}if (expSymbolBit == -1) {strResult = strRaw;} else {if (signIndex == 1) {int baseDecimalBits;if (baseDotBit == -1) {baseDecimalBits = 0;} else {baseDecimalBits = expSymbolBit - baseDotBit - 1;}if (baseDecimalBits >= index) {if (baseDotBit == -1) {strResult = null;} else {strResult += strRaw.substring(baseStartBit, baseDotBit);strResult += strRaw.substring(baseDotBit + 1, baseDotBit + 1 + index);strResult += ".";strResult += strRaw.substring(baseDotBit + 1 + index, expSymbolBit);}} else {if (baseDotBit == -1) {strResult += strRaw.substring(baseStartBit, expSymbolBit);} else {strResult += strRaw.substring(baseStartBit, baseDotBit);strResult += strRaw.substring(baseDotBit + 1, expSymbolBit);}for (i = 0; i < index - baseDecimalBits; i++) {strResult += "0";}}} else if (signIndex == -1) {int baseIntegerBits;if (baseDotBit == -1) {baseIntegerBits = expSymbolBit - baseStartBit;} else {baseIntegerBits = baseDotBit - baseStartBit;}if (baseIntegerBits > index) {if (baseDotBit == -1) {strResult += strRaw.substring(baseStartBit, expSymbolBit - index);strResult += ".";strResult += strRaw.substring(expSymbolBit - index, expSymbolBit);} else {strResult += strRaw.substring(baseStartBit, baseDotBit - index);strResult += ".";strResult += strRaw.substring(baseDotBit - index, baseDotBit);strResult += strRaw.substring(baseDotBit + 1, expSymbolBit);}} else {strResult += "0.";for (i = 0; i < index - baseIntegerBits; i++) {strResult += "0";}if (baseDotBit == -1) {strResult += strRaw.substring(baseStartBit, expSymbolBit);} else {strResult += strRaw.substring(baseStartBit, baseDotBit);strResult += strRaw.substring(baseDotBit + 1, expSymbolBit);}}} else {strResult = null;}}System.out.println("***pngTools-convertToString(double):strResult = " + strResult);return strResult;}}

 

 

package lab.sodino.img;public class CRCUtil {private static int[] crc_table;private static void make_crc_table() {int c;int n;int k;crc_table = new int[256];for (n = 0; n < 256; n++) {c = n;for (k = 0; k < 8; k++) {if ((c & 1) == 1) {c = -306674912 ^ (c >>> 1);} else {c = c >>> 1;}}crc_table[n] = c;}}private static int update_crc(byte[] buf, int nStart, int nLen) {int c = -1;int n;if (crc_table == null) {make_crc_table();}for (n = nStart; n < nLen + nStart; n++) {c = crc_table[(c ^ buf[n]) & 255] ^ (c >>> 8);}return c;}/** *//** * @鍔熻兘: 鐢熸CRC鏍￠獙鐮? * @傛暟: byte[] buf鏁版?尯鍩br>int nStart璧峰浣?缃br>int nLen璁＄畻闀垮害<br> * @杩斿洖鍊 int CRC鏍￠獙鐮? * */public static int checksum(byte[] buf, int nStart, int nLen) {return update_crc(buf, nStart, nLen) ^ -1;}}

 

 

package lab.sodino.img;public class BytesTools { static int bytes2int(byte[] b) { //byte[] b=new byte[]{1,2,3,4}; int mask = 0xff; int temp = 0; int res = 0; for (int i = 0; i < 4; i++) { res <<= 8; temp = b[i] & mask; res |= temp; } return res; } static byte[] int2bytes(int num) { byte[] b = new byte[4]; int mask = 0xff; for (int i = 0; i < 4; i++) { b[i] = (byte) (num >>> (24 - i * 8)); } return b; } /** */ /** * @鍔熻兘: 灏嗕竴涓猧nt鍊艰浆涓篵yte鏁扮粍 * @?傛暟: int nNum 瑕?杞殑int鍊? * @杩斿洖鍊? byte[] bytesRet 杞?庣殑byte鏁扮粍 */ public static byte[] intToBytes(int nNum) { byte[] bytesRet = new byte[4]; bytesRet[0] = (byte) ((nNum >> 24) & 255); bytesRet[1] = (byte) ((nNum >> 16) & 255); bytesRet[2] = (byte) ((nNum >> 8) & 255); bytesRet[3] = (byte) (nNum & 255); return bytesRet; } /** */ /** * @鍔熻兘: 灏嗕竴涓暱搴︿负4 byte鏁扮粍杞负int * @?傛暟: byte[] bNum瑕?杞殑瀛楄妭鏁扮粍 * @杩斿洖鍊? int retInt 杞?庣殑int鍊? */ public static int bytesToInt(byte[] bNum) { return bytesToInt(bNum, 0); } /** */ /** * @鍔熻兘: 灏嗕竴涓暱搴︿负4 byte鏁扮粍杞负int * @?傛暟: byte[] bNum瑕?杞殑瀛楄妭鏁扮粍<br>int nStartPos璧峰浣?缃? * @杩斿洖鍊? int retInt 杞?庣殑int鍊? */ public static int bytesToInt(byte[] bNum, int nStartPos) { int retInt = 0; retInt = ((bNum[nStartPos++] & 255) << 24); retInt += (bNum[nStartPos++] & 255) << 16; retInt += (bNum[nStartPos++] & 255) << 8; retInt += bNum[nStartPos] & 255; return retInt; } /** * @鍔熻兘: 灏嗕竴涓狪NT鐨勮浆涓篵yte鏁扮粍?庤拷鍔犲埌鎸囧畾鏁扮粍?? * @?傛暟: byte[] bDes杩藉姞鐩爣<br>int bSrc瑕?杩藉姞鐨刬nt * @杩斿洖鍊? byte[] 杩藉姞?庣殑瀛楄妭鏁扮粍 */ public static byte[] appendBytes(byte[] bDes, int bSrc) { return appendBytes(bDes, new byte[]{(byte) bSrc}); } /** */ /** * @鍔熻兘: 灏嗕竴涓猙yte 鏁扮粍杩藉姞鍒版寚瀹氭暟缁勫?? * @?傛暟: byte[] bDes杩藉姞鐩爣<br>byte[] bSrc瑕?杩藉姞鐨勫瓧鑺傛暟缁? * @杩斿洖鍊? byte[] 杩藉姞?庣殑瀛楄妭鏁扮粍 */ public static byte[] appendBytes(byte[] bDes, byte[] bSrc) { byte[] ret = null; if (bDes == null) { ret = bSrc; } if (bSrc == null) { ret = bDes; } if (bDes != null && bSrc != null) { ret = new byte[bDes.length + bSrc.length]; System.arraycopy(bDes, 0, ret, 0, bDes.length); System.arraycopy(bSrc, 0, ret, bDes.length, bSrc.length); } return ret; } /** */ /** * @鍔熻兘: 鎴?栨寚瀹歜yte 鏁扮粍涓殑瀛楄妭鏁扮粍 * @?傛暟: byte[] bSrc鍘熷瓧鑺傛暟缁?br>int nStartPos鍘熷瓧鑺傛暟缁勮捣濮嬩?缃?br>int nLen鎴?栭暱搴? * @杩斿洖鍊? byte[] 鎴?栧?庣殑瀛楄妭鏁扮粍 */ public static byte[] subBytes(byte[] bSrc, int nStartPos, int nLen) { byte[] ret = null; if (bSrc != null) { ret = new byte[nLen]; if ((nStartPos + nLen) <= bSrc.length) { System.arraycopy(bSrc, nStartPos, ret, 0, nLen); } } return ret; } /** */ /** * @鍔熻兘: 鏌ユ壘瀛?瀛楄妭鏁扮粍鍦ㄧ埗瀛楄妭鏁扮粍涓殑浣?缃? * @?傛暟: byte[] bSrc鐖跺瓧鑺傛暟缁?br>byte[] bSub瀛?瀛楄妭鏁扮粍 * @杩斿洖鍊? int 鍦ㄧ埗瀛楄妭鏁扮粍涓殑浣?缃紝濡傛湭鎵惧埌鍒欒繑鍥?1 */ public static int findSubBytesPos(byte[] bSrc, byte[] bSub) { int ret = -1; int nSubLen = bSub.length; int nLen = bSrc.length - nSubLen; boolean b = true; for (int i = 0; i <= nLen; i++) { b = true; for (int j = 0; j < nSubLen; j++) { if (bSrc[i + j] != bSub[j]) { b = false; break; } } if (b) { ret = i; break; } } return ret; }}